• JLA Vol:15 Iss:1 (Deposition of WC/Ni clad layers with a pulsed Nd:YAG laser)

    M. Brandt
    Industrial Research Institute Swinburne, Swinburne University of Technology, Melbourne Vic 3122, Australia

    S. W. Huang
    M. Samandi
    Department of Materials Engineering, Surface Engineering Research Centre (SERC), University of Wollongong, NSW 2522, Australia

    A series of experiments was performed to investigate the production of WC/Ni clad layers on H13 tool steel using a pulsed Nd:YAG laser and optical fibers. The effects of laser parameters, such as laser pulse energy and pulse frequency as well as material parameters such as powder composition and shape on the clad layer geometry and microstructure, were investigated. The microstru...


  • JLA Vol:15 Iss:1 (Direct write of resistive lines on SiC)

    T. Y. Plew
    K. H. Leong

    J. M. Redwing
    Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802

    The optimal parameters of a nanosecond pulsed laser for writing of tracks of controlled resistance onto high resistivity silicon carbide were investigated. A controlled energy deposition approach was carried out to minimize changes to the surface topography. The effect of fluence and irradiance on the ability to write narrow lines with controlled resistance were the explored parameters. Two focal length lenses and a large range of fluences were chosen to determine the best paramete...


  • JLA Vol:15 Iss:1 (Dual laser beam modification of high alumina ceramics)

    D. Triantafyllidis

    J. R. Bernstein
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    L. Li
    Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    F. H. Stott
    Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, United Kingdom

    Alumina-based refractory materials are extensively used in high-temperature applications, such as linings in waste incinerators. A sign...


  • JLA Vol:15 Iss:1 (Effect of wire feed position on laser welding with filler wire)

    A. S. Salminen
    V. P. Kujanpa¨a¨
    Lappeenranta University of Technology, Laser Processing Centre, Tuotantokatur 2, FIN 53850 Lappeenranta, Finland

    The utilization of the laser welding process with filler wire addition is often considered a complicated and difficult process which has too high accuracy demands for a work shop floor. This study shows the effect of some of the most important welding variables to the quality and efficiency of laser welding when welding with filler wire. The material used was a common structural steel St52/37 of 6 mm in thickness. The joint type used was a butt joint. Acceptable weld quality was achieved with most of the tested p...


  • JLA Vol:15 Iss:1 (Laser penetration spike welding: A microlaser welding technique enabling novel product designs and constructions)

    D. K. Dijken
    W. Hoving
    Centre for Industrial Technology, CFT, Philips Electronics Nederland BV, Glaslaan 2, P.O. Box 218, 5600 MD Eindhoven, The Netherlands

    J. Th. M. De Hosson
    Department of Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

    A novel method for laser penetration microspot welding of sheet metal is presented. With this so called “laser spike-welding,” large gap tolerances are allowed. Depending on the ratio of laser spot radius to top plate thickness, gaps of 100% of the top layer thickness and more can be bridged. With conventional keyhole penetrati...


  • JLA Vol:15 Iss:1 (Laser welding closed-loop power control)

    Claus Bagger
    Flemming O. Olsen
    Manufacturing Engineering and Management, Materials and Process Technology, Technical University of Denmark, Building 425, DK-2800 Lyngby, Denmark

    A closed-loop control system is developed to maintain an even seam width on the root side of a laser weld by continually controlling the output laser power of a 1500 W CO2 laser. Quality control is done by a photodiode monitoring the root-side light emission from the process. The control system is successfully demonstrated to work in the bead-on-plate configuration on 2 mm sheets, both at constant speeds and at speeds ranging from 0.32 to more than 0.72 m/min in one welding tri...


  • JLA Vol:15 Iss:1 (Melting characteristics of metals by combined laser beams with different wavelengths)

    Jong Hyun Moon
    Graduate School of Osaka University, Suitasi, Osaka 565-0871, Japan

    Masami Mizutani
    Seiji Katayama
    Akira Matsunawa
    Joining and Welding Research Institute, Osaka University 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

    Infrared CO2 and yttritium–aluminum–garnet (YAG) lasers have great difficulty in melting metals such as pure aluminum and copper possessing high reflectivity and high thermal and electrical conductivity. On the other hand, the laser absorptance of such metals generally increases with the decrease in the wavelength, and thus the application of laser with higher power and shorte...


  • JLA Vol:15 Iss:1 (Microstructure and corrosion behavior of high power diode laser deposited Inconel 625 coatings)

    J. Tuominen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. Vuoristo
    T. Ma¨ntyla¨
    Institute of Materials Science, Tampere University of Technology, FIN-33101 Tampere, Finland

    J. Latokartano
    J. Vihinen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. H. Andersson
    Institute of Production Engineering, Tampere University of Technology, FIN-33101 Tampere, Finland

    A series of experiments were performed to investigate the one-step laser cladding of Inconel 625 powder, injected off-axially onto m...


  • JLA Vol:15 Iss:1 (Specific energy for pulsed laser rock drilling)

    Z. Xu
    C. B. Reed
    G. Konercki
    Technology Development Division, Argonne National Laboratory, Argonne, Illinois 60540

    R. A. Parker
    Parker Geoscience Consulting, LLC, Arvada, Colorado 80403

    B. C. Gahan
    Gas Technology Institute, Des Plains, Illinois 60018

    S. Batarseh
    R. M. Graves
    Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401

    H. Figueroa
    Petroleos de Venezuela INTEVEP, S.A., Caracas 1070A, Venezuela

    N. Skinner
    Halliburton Energy Service, Carrollton, Texas 75006

    Application of advanced high power ...


  • JLA Vol:15 Iss:2 (Antigalling and low friction properties of a laser processed Co-based material)

    D. H. E. Persson
    Duroc AB, Umeå, Sweden

    S. Jacobson
    S. Hogmark
    The Tribomaterials Group at Ångstro¨m Laboratory, Uppsala University, Sweden

    The antigalling and low friction properties of a CO2-laser processed Co-based material (Stellite 21) was investigated under high-load sliding conditions. Dry sliding tests were carried out at both room temperature and at 250 °C. The tests were performed by sliding two identical specimens against each other in a dedicated test. A low and stable friction coefficient at a level of about 0.20, and relatively independent on load and sliding speed, was obtained after a short runn...